ceph: fix NULL dereference in ceph_queue_cap_snap()

old_snapc->seq is used in dout(...)

Signed-off-by: Yan, Zheng <zyan@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index 9caaa7ffc93f..eadf2c33edc6 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -551,7 +551,6 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
         ci->i_wrbuffer_ref_head = 0;
         capsnap->context = old_snapc;
         list_add_tail(&capsnap->ci_item, &ci->i_cap_snaps);
-        old_snapc = NULL;
 
         if (used & CEPH_CAP_FILE_WR) {
                 dout("queue_cap_snap %p cap_snap %p snapc %p"
@@ -563,6 +562,7 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
                 __ceph_finish_cap_snap(ci, capsnap);
         }
         capsnap = NULL;
+        old_snapc = NULL;
 
 update_snapc:
         if (ci->i_head_snapc) {